Alert transport cleanup, no_proxy support and other proxy cleanups (#14763)

* Add no_proxy and other proxy related settings
Set user agent on all http client requests
Unify http client usage

* Style fixes

* Remove useless use statements

* Correct variable, good job phpstan

* Add tests
fix https_proxy bug
add tcp:// to the config settings format

* style and lint fixes

* Remove guzzle from the direct dependencies

* Use built in Laravel testing functionality

* update baseline

LibreNMS/Util/Http.php

@@ -0,0 +1,49 @@
+<?php
+/**
+ * Http.php
+ *
+ * -Description-
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ *
+ * @link       https://www.librenms.org
+ *
+ * @copyright  2022 Tony Murray
+ * @author     Tony Murray <murraytony@gmail.com>
+ */
+
+namespace LibreNMS\Util;
+
+use Illuminate\Http\Client\PendingRequest;
+use Illuminate\Support\Facades\Http as LaravelHttp;
+use LibreNMS\Config;
+
+class Http
+{
+    /**
+     * Create a new client with proxy set if appropriate and a distinct User-Agent header
+     */
+    public static function client(): PendingRequest
+    {
+        return LaravelHttp::withOptions([
+            'proxy' => [
+                'http' => Proxy::http(),
+                'https' => Proxy::https(),
+                'no' => Proxy::ignore(),
+            ],
+        ])->withHeaders([
+            'User-Agent' => Config::get('project_name') . '/' . Version::VERSION, // we don't need fine version here, just rough
+        ]);
+    }
+}